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who.c revision 1.16 
      1 /*	$NetBSD: who.c,v 1.16 2005/07/22 14:23:05 peter Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Michael Fischbein.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #ifndef lint
     37 __COPYRIGHT(
     38 "@(#) Copyright (c) 1989, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)who.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 __RCSID("$NetBSD: who.c,v 1.16 2005/07/22 14:23:05 peter Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/types.h>
     50 #include <sys/stat.h>
     51 
     52 #include <err.h>
     53 #include <locale.h>
     54 #include <pwd.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <time.h>
     59 #include <unistd.h>
     60 
     61 #include "utmpentry.h"
     62 
     63 static void output_labels(void);
     64 static void who_am_i(const char *, int);
     65 static void usage(void);
     66 static void process(const char *, int);
     67 static void print(const char *, const char *, time_t, const char *);
     68 static void quick(const char *);
     69 
     70 static int show_term;			/* show term state */
     71 static int show_idle;			/* show idle time */
     72 
     73 extern int maxname, maxline, maxhost;
     74 
     75 int
     76 main(int argc, char *argv[])
     77 {
     78 	int c, only_current_term, show_labels, quick_mode, default_mode;
     79 
     80 	setlocale(LC_ALL, "");
     81 
     82 	only_current_term = show_term = show_idle = show_labels = 0;
     83 	quick_mode = default_mode = 0;
     84 
     85 	while ((c = getopt(argc, argv, "HmqsTu")) != -1) {
     86 		switch (c) {
     87 		case 'H':
     88 			show_labels = 1;
     89 			break;
     90 		case 'm':
     91 			only_current_term = 1;
     92 			break;
     93 		case 'q':
     94 			quick_mode = 1;
     95 			break;
     96 		case 's':
     97 			default_mode = 1;
     98 			break;
     99 		case 'T':
    100 			show_term = 1;
    101 			break;
    102 		case 'u':
    103 			show_idle = 1;
    104 			break;
    105 		default:
    106 			usage();
    107 			/* NOTREACHED */
    108 		}
    109 	}
    110 	argc -= optind;
    111 	argv += optind;
    112 
    113 	if (chdir("/dev")) {
    114 		err(EXIT_FAILURE, "cannot change directory to /dev");
    115 		/* NOTREACHED */
    116 	}
    117 
    118 	if (default_mode)
    119 		only_current_term = show_term = show_idle = 0;
    120 
    121 	switch (argc) {
    122 	case 0:					/* who */
    123 		if (quick_mode) {
    124 			quick(NULL);
    125 		} else if (only_current_term) {
    126 			who_am_i(NULL, show_labels);
    127 		} else {
    128 			process(NULL, show_labels);
    129 		}
    130 		break;
    131 	case 1:					/* who utmp_file */
    132 		if (quick_mode) {
    133 			quick(*argv);
    134 		} else if (only_current_term) {
    135 			who_am_i(*argv, show_labels);
    136 		} else {
    137 			process(*argv, show_labels);
    138 		}
    139 		break;
    140 	case 2:					/* who am i */
    141 		who_am_i(NULL, show_labels);
    142 		break;
    143 	default:
    144 		usage();
    145 		/* NOTREACHED */
    146 	}
    147 
    148 	return 0;
    149 }
    150 
    151 static void
    152 who_am_i(const char *fname, int show_labels)
    153 {
    154 	struct passwd *pw;
    155 	const char *p;
    156 	char *t;
    157 	time_t now;
    158 	struct utmpentry *ehead, *ep;
    159 
    160 	/* search through the utmp and find an entry for this tty */
    161 	if ((p = ttyname(STDIN_FILENO)) != NULL) {
    162 
    163 		/* strip any directory component */
    164 		if ((t = strrchr(p, '/')) != NULL)
    165 			p = t + 1;
    166 
    167 		(void)getutentries(fname, &ehead);
    168 		for (ep = ehead; ep; ep = ep->next)
    169 			if (strcmp(ep->line, p) == 0) {
    170 				if (show_labels)
    171 					output_labels();
    172 				print(ep->name, ep->line, (time_t)ep->tv.tv_sec,
    173 				    ep->host);
    174 				return;
    175 			}
    176 	} else
    177 		p = "tty??";
    178 
    179 	(void)time(&now);
    180 	pw = getpwuid(getuid());
    181 	if (show_labels)
    182 		output_labels();
    183 	print(pw ? pw->pw_name : "?", p, now, "");
    184 }
    185 
    186 static void
    187 process(const char *fname, int show_labels)
    188 {
    189 	struct utmpentry *ehead, *ep;
    190 	(void)getutentries(fname, &ehead);
    191 	if (show_labels)
    192 		output_labels();
    193 	for (ep = ehead; ep != NULL; ep = ep->next)
    194 		print(ep->name, ep->line, (time_t)ep->tv.tv_sec, ep->host);
    195 }
    196 
    197 static void
    198 print(const char *name, const char *line, time_t t, const char *host)
    199 {
    200 	struct stat sb;
    201 	char state;
    202 	static time_t now = 0;
    203 	time_t idle;
    204 
    205 	state = '?';
    206 	idle = 0;
    207 
    208 	if (show_term || show_idle) {
    209 		if (now == 0)
    210 			time(&now);
    211 
    212 		if (stat(line, &sb) == 0) {
    213 			state = (sb.st_mode & 020) ? '+' : '-';
    214 			idle = now - sb.st_atime;
    215 		}
    216 
    217 	}
    218 
    219 	(void)printf("%-*.*s ", maxname, maxname, name);
    220 
    221 	if (show_term)
    222 		(void)printf("%c ", state);
    223 
    224 	(void)printf("%-*.*s ", maxline, maxline, line);
    225 	(void)printf("%.12s ", ctime(&t) + 4);
    226 
    227 	if (show_idle) {
    228 		if (idle < 60)
    229 			(void)printf("  .   ");
    230 		else if (idle < (24 * 60 * 60))
    231 			(void)printf("%02ld:%02ld ",
    232 				     (long)(idle / (60 * 60)),
    233 				     (long)(idle % (60 * 60)) / 60);
    234 		else
    235 			(void)printf(" old  ");
    236 	}
    237 
    238 	if (*host)
    239 		(void)printf("\t(%.*s)", maxhost, host);
    240 	(void)putchar('\n');
    241 }
    242 
    243 static void
    244 output_labels(void)
    245 {
    246 	(void)printf("%-*.*s ", maxname, maxname, "USER");
    247 
    248 	if (show_term)
    249 		(void)printf("S ");
    250 
    251 	(void)printf("%-*.*s ", maxline, maxline, "LINE");
    252 	(void)printf("WHEN         ");
    253 
    254 	if (show_idle)
    255 		(void)printf("IDLE  ");
    256 
    257 	(void)printf("\t%.*s", maxhost, "FROM");
    258 
    259 	(void)putchar('\n');
    260 }
    261 
    262 static void
    263 quick(const char *fname)
    264 {
    265 	struct utmpentry *ehead, *ep;
    266 	int num = 0;
    267 
    268 	(void)getutentries(fname, &ehead);
    269 	for (ep = ehead; ep != NULL; ep = ep->next) {
    270 		(void)printf("%-*s ", maxname, ep->name);
    271 		if ((++num % 8) == 0)
    272 			(void)putchar('\n');
    273 	}
    274 	if (num % 8)
    275 		(void)putchar('\n');
    276 
    277 	(void)printf("# users = %d\n", num);
    278 }
    279 
    280 static void
    281 usage(void)
    282 {
    283 	(void)fprintf(stderr, "usage: %s [-HmqsTu] [file]\n       %s am i\n",
    284 	    getprogname(), getprogname());
    285 	exit(EXIT_FAILURE);
    286 }
    287